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2 Thunderstorms have warm temperatures, moisture, and rising air, which may be supplied by a low-pressure system.Thunderstorms have a three-stage life cycle: the cumulus stage, the mature stage, and the dissipation stage.

3 The cumulus stage is dominated by cloud formation and updrafts.After the cumulus stage, downdrafts, which are air currents moving vertically toward the ground, begin to form.

4 In the mature stage, heavy winds, rain, and lightning dominate the area.

16 Structure of a Hurricane- StormsStructure of a HurricaneIn a hurricane, air moves rapidly around a low-pressure area called the eye.16

17 Warm, humid air rises and begins to spiralBegins as a low-pressure area over warm water, or a tropical disturbanceWarm, humid air rises and begins to spiralAs air rises, more warm, moist air is drawn into the system, and the hurricane gains energyAs winds spiral inward, bands of high winds and heavy rains form.